On July 30, the first Saturday that same-sex marriage will be legal in New York State, two dozen couples will be wed inside two pop-up chapels that will appear for about 10 hours at the Merchants' Gate entrance to Central Park, near Columbus Circle.

The designs for the two chapels will be selected from entries to a contest that began last week and ends July 21. The winning design will be announced the next day, giving architects only eight days to bring their concepts to fruition.